In the world of Android, the default theme for the phone is usually black or dark gray. However, if you want to change the look of your Android device to a more colorful and lively look, you can use the free, open-source, and easy-to-use Theme Dialer application.

This application allows you to change the look and style of your Android device, and it has a built-in collection of beautiful themes and backgrounds. You can choose from a variety of themes, and you can even change the color of the font and text on your phone.

This application is completely free, and you can download it on your Android device. You don't need to pay a penny to use it.